Patent US3939434A successfully refreshed from Google Patents.
US3939434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband DC current amplifier
Assignee: Tektronix Inc
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Filing: 1974-08-23
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Granted: 1976-02-17
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Expires: 1994-08-23
Abstract
Abstract A wideband DC current amplifier comprising a pair of transducers, the collector of the input transistor being connected to it's base through a compensating resistance and directly to the base of a second transistor is provided.
Inventors
- 👤 Philip Stephen Crosby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:43
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/26; G05F3/265; H03F1/302; H03F3/00; H03F3/34; H03F3/343
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A current amplifier, comprising: a first and second transistor means, each of said transistor means having a base, a collector, and an emitter; means directly connecting the collector of said first transistor means to the base of said second transistor means, said means having a resistive value of substantially zero ohms; first and second resistor means serially connected between the emitters of said first and second transistor means, respectively, and a reference potential; third resistor means serially connected between the base and collector of said first transistor means, wherein the ratio of said first resistor means to said second resistor means plus unity equals the ratio of said third resistor means to said second resistor means; means for applying input current to the collector of said first transistor means; and means for applying a repeated input current to the collector of said second transistor means.
Claim 2
Dependent Claim
145 words
A current amplifier, comprising: a first and second transistor means, each of said transistor means having a base, a collector, and an emitter; means directly connecting the collector of said first transistor means to the base of said second transistor means, said means having a resistive value of substantially zero ohms; first and second resistor means serially connected between the emitters of said first and second transistor means, respectively, and a reference potential; third resistor means serially connected between the base and collector of said first transistor means, wherein the ratio of said first resistor means to said second resistor means plus unity equals the ratio of said third resistor means to said second resistor means; means for applying input current to the collector of said first transistor means; and means for applying a repeated input current to the collector of said second transistor means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |